Diamond told People magazine, that he began noticing something was off when he and Voorhies recorded commentary for a "Saved By the Bell" box set in 2003.

Diamond starred on the series as geeky Samuel "Screech" Powers who was hopelessly in love with rich girl Lisa Turtle, played by Voorhies. Both actors originated their "Saved By The Bell" characters on the television series "Good Morning, Miss Bliss," which ran from 1988 to 1989. The show later went on to be revamped and became "Saved by the Bell," which ran from 1989 to 1993.

"I was always used to playing off of her and looking into her eyes," Diamond told the magazine about Voorhies. "When I saw her at the commentary, it wasn't the Lark I knew."

Voorhies and her former "Saved by the Bell" co-stars, with the exception of Diamond who reportedly did not take part in the shoot, reunited for a People magazine spread in 2009. She and Diamond crossed paths again while filming an indie movie called "Little Creeps."

"Part of me is putting it out of my mind and not thinking about it, but the other part is that of concern," Diamond said. "Man, I hope she's all right."

Voorhies reportedly denied that she is sick and called her mother "over-loving." Voorhies and her mother live together in Pasadena, California.